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StormWindsStudio ICND1 > Session 3 > Flashcards

Session 3 Flashcards

Routing,

1
Q

If you are trying to reach a web server outside your network… the Packet will be destined to what address but the Frame will have whos MAC?

A

Packet - Web server IP

Frame - Your default gateway mac

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2
Q

Do you have to have an exact match in your routing table?

A

No it does not have. It could have a 0.0.0.0/0 - which means any network or default route

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3
Q

when a router is moving a packet to another device, what does it change

A

It changes the frame since now it puts its MAC as the source and the destination of its next hope as destination mac.

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4
Q

what command do you use on the router to show the arp cache ?

A

show ip arp.

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5
Q

what is 10000000 in decimal?

A

128

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6
Q

what is 11000000 in decimal?

A

192

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7
Q

what is 11100000 in decimal?

A

224

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8
Q

what is 11110000 in decimal?

A

240

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9
Q

what is 11111000 in decimal?

A

248

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10
Q

what is 11111100 in decimal?

A

252

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11
Q

what is 11111110 in decimal?

A

254

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12
Q

what is 11111111 in decimal?

A

255

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13
Q

Directly connected address in your routing table means what?

A

there is an IP address assigned to an interface.

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14
Q

can you set up 2 interfaces on a router going to the same network?

A

at first it will says OVERLAP.. but you can force it but IT WILL CAUSE ROUTING ISSUES.. DONT DO IT

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15
Q

What can be troubleshooting questions you can ask if a route is not in the routing table of a switch?

A
  1. Is it directly connected to the router meaning is there an IP address assigned to a interface.
  2. Is the interface up. it has to be up to be shown in the routing table.
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16
Q

Local route is what?

A

a very specific route that points to the actual network interface.

The local route describes the IP address as a host. It make decisions destined to the router faster (telnet or ssh)

matches the ip address of router interfaces.

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17
Q

Ripv2 uses what algorithm and metric

A

Distance Vector and Hop Count

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18
Q

what is an Autonomous System (AS)

A

a collection of networks overseen by 1 organization.

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19
Q

what is IGP

A

interior Gateway protocol - focus on learning routes within 1 local autonomous system

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20
Q

what is EGP

A

exterior gateway protocol - exchanges information from on Autonomous system with another.

21
Q

how do routers learn which route to add to the routing table if it learned it from multiple sources?

A

it uses Administrative Distances

22
Q

how can you define administrative distance?

A

is is the reliability of the route source.

23
Q

connected protocol have an administrative distance of?

A

0

24
Q

static protocol have an administrative distance of?

A

1

25
Q

eBGP protocol have an administrative distance of?

A

20

26
Q

EIGRP protocol have an administrative distance of?

A

90

27
Q

OSPF protocol have an administrative distance of?

A

110

28
Q

Rip v1 and v2 protocol have an administrative distance of?

A

120

29
Q

External EIGRP protocol have an administrative distance of?

A

170

30
Q

iBGP protocol have an administrative distance of?

A

200

31
Q

what metric does EIGRP use?

A

lowest bandwidth and delay

32
Q

what metric does OSPF use?

A

Total cost

33
Q

what metrics does BGP use?

A

attributes

34
Q

Explain Distance Vector?

A

Is like when traveling down a road and you see a sign New york -next right. etc

Not a lot of details just know that to get to the destination you have to take this route.

35
Q

Explain Link State algorithm?

A

This is like when we use a GPS. the packet has all the necessary details to get to its destination.

36
Q

Routers determine best source using what?

A

Administrative Distances. The best # gets adding to the routing table.

37
Q

Routing source administrative distance

Connected?

A

= 0

You cannot get better than a connected device to your router

38
Q

Routing source administrative distance.

static

A

in order to get to this network - an admin has to put this in the router.

= 1

39
Q

Routing source administrative distance.

eBGP

A

= 20

40
Q

Routing source administrative distance.

EIGRP

A

= 90

41
Q

Routing source administrative distance.

OSPF

A

= 110

42
Q

Routing source administrative distance.

Rip v1 and v2

A

= 120

43
Q

Routing source administrative distance.

External EIGRP

A

=170

44
Q

Routing source administrative distance.

iBGP

A

=200

45
Q

How do you find an IP of a neighboring device if you are not given the IP address

A

show cdp n detail

or ping 255.255.255.255

46
Q

what is proxy arp?

A

allows a router to response on behalf of an address if it can get you to an address.

47
Q

floating static routes?

A

is having a back up static route if the primary fails.

by default it will do load balancing but the way to just change it to just use it if primary fails. you need to change the administrative distance.

When you change the administrative distance to a higher number it will be removed from the routing table since the routing table only shows the best route with the administrative distance.

48
Q

what are things to check if a static route is not visible on the routing table?

A

see if there is a connected route since connected routes are better than static

can you reach the next hop address? It needs to be able to reach the next hop. See if the interfaces on the other side is down.

Di you put the right IP address for the next hop.

StormWindsStudio ICND1 (10 decks)

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